Wideband interference cancellation using DSP algorithms

Abstract

A method and system is provided for detecting and characterizing pulsed threat radar emitters through heavy in-band interference. System includes an advanced digital signal processing method provides spatial and temporal interference cancellation, super-resolution direction-finding, and high resolution spectrum analysis techniques. The system receives the digitized output of a discriminator bank and produces highly accurate threat pulse radio frequency estimates. The invention further provides a two-channel configuration for a DF subsystem, to perform adjacent-beam direction-finding through severe interference environments. The invention provides increased sensitivity, increased frequency accuracy, and up to 40 dB of increased interference look-through capability in ES system but remains transparent to ES system functioning and to ES system operators.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of priority of U.S. Provisional Application Ser. No. 60 / 639,122, filed Dec. 23, 2004, which application is fully incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention generally relates to radar signal processing systems. More particularly, the present invention relates to electronic support systems for detection of enemy radar surveillance and munitions targeting systems. More specifically, the present invention relates to systems for extracting information in the presence of interfering carrier wave signals. [0004] 2. Description of the Prior Art [0005] Electronic support (“ES”) systems are used by Navy ships and military aircraft to provide sensitive and timely detection of illuminating signals from enemy radar surveillance and munitions targeting systems, allowing adequate time for the targeted military vessel to successfully enga...

AI Technical Summary

Benefits of technology

"The invention is a method and system for detecting and characterizing pulsed threat radar emitters through heavy in-band interference. It uses a novel processing method called instantaneous frequency measurement dominant mode prediction (IFM-DMP) which combines elements from spatial and temporal interference cancellation, super-resolution direction-finding, and high resolution spectrum analysis techniques. The method can be retrofitted into existing IFM receiver architectures and is transparent to the existing system. It provides greater sensitivity, accuracy, and robustness than prior art methods and can detect and measure threat pulses in heavy interference environments. The invention also provides a single-channel and two-channel configuration for different applications. Overall, the invention increases sensitivity, accuracy, and interference look-through capability in the existing system without affecting its functioning or operators."

Problems solved by technology

In particular, IFM-DMP continues to detect SOI pulses and generate accurate PDWs in heavy interference environments that cause catastrophic failure of existing methods.

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